What if they're indifferent about our existence? Would you be insecure knowing that a superior species existed that didn't think we were interesting enough to be bothered with?
As long as they don’t plan to demolish Earth to make way for an intergalactic highway (a reference to The Hitchhiker’s Guide to the Galaxy), we’re fine. Humans are not out to get ants, but imagine how many ant colonies we have destroyed to build our highways. Indifference does not preclude a threat.
